Jonathan joined NICE in January 2023 as chief medical officer, from March 2023 has acted as the interim director of the centre for guidelines and in May 2024 was also appointed the deputy chief executive officer for the organisation.

Prior to this he was the interim chief clinical information officer (CCIO) at NHS England (2022), the chief medical officer (CMO) of NHS Digital (2019 to 2022), and the national clinical director for urgent and emergency care at NHS England (2013 to 2019).

In his clinical work, Jonathan is a consultant in emergency medicine at the Bristol Royal Infirmary and does regular shifts with the Great Western Air Ambulance, which he established as its first medical advisor between 2007 and 2011.

Jonathan is professor of emergency care in the school of health and social wellbeing at the University of the West of England. His main research interests relate to cardiac arrest, emergency and pre-hospital care, service organisation and delivery, and design research.